Improved slide-valve



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UNITEDl STATES PATENT OFFICE..

A. n, woonRUFF, OF LANsINc', IOwA.

4IM PROVED SLI DE-VALVE.

Specification forming part of Letters Patent No. 56,841,` dated July 31,1866.

To all 'whom it may concern:

Be it known that I, A. H. WOODRUFF, of Lansing, in the county ofAllamakee and State i of Iowa, have invented a new and ImprovedSteam-Valve; and I do hereby declare that the following is a full,clear,and exact description thereof', which will enable others skilled in theart to make and use the same, reference being had to the accompanyingdrawings, forming a part of this specilcation, in which- Figure lrepresents a longitudinal vertical section of this invention. Fig. 2 isa horizontal section of the same. Fig. 3 is a longitudinal section of adouble-acting valve constructed according to my invention. Fig. 4 is ahorizontal section of the same. Fig. 5 is an end view of the same.

Similar letters of reference .indicate like parts.

This invention consists in au angular valve which is iitted into anangular seat, one side ot which contains the exhaust and the other thesteam port or ports, in such a manner that with a valve of comparativelysmall area large openings for the supply and discharge of the steam areobtained.

It consists, further, in the arrangement of recesses in the exhaust sideof the seat or in the steam side, or in both, in such a manner that thepressure of the steam ,on the back of the valve is partially or whollybalanced and that a full supply of steam is obtained at the beginningofthe stroke.

A A represent two valves, which are of angular form and fitted oncorresponding angular seats B B', as clearly shown in Figs. 1 and 2 ofthe drawings. The seat B is provided with two ports, a b, the port a toadmit steam to one end of the cylinder, and the port b to serve asexhaust-port; and the seat B is provided with corresponding ports, a bwhich serve as supply and exhaust ports, respectively, for the oppositeend of the cylinder. The valves are hollow triangular boxes open onthose sides which fit o n the steam-supply sides of the seats, andperforated with an oblong slot, c or c', on those sides which t on theexhaust sides of the seat, and the exhaust sides of the valves areprovided with projecting flanges or lips d d', the object of which willbe presently explained. Furthermore, the steam sides of the seats arefurnished with recesses e e', and the exhaust sides with re cesses ff.

The operation is as follows: A reciprocating motion is imparted to thevalves A A by a rock-shaft or any other similar means, and if saidvalves arrive in the position shown in Fig. l of the drawings thesteam-port a begins to open and steam is admitted to the correspondingend of the cylinder, while the slot 0 in the valve A passes the edge ,ofthe exhaust-port b, thereby opening communication between the ports aand b in the seat B and allowing the steam from that end of the cylinderto exhaust.

By referring to the valve A it will be noticed that the same, as soon asthe port c begins to take steam, is in such a position that steam passesthrough the recess e, and also through the recess f and slot c', to theinterior ofthe same, and consequently the supply of steam is materiallyincreased at the beginning of thc stroke, and at the same time thepressure ofthe steam on the back of the valve is partially or whollybalanced by the steam admitted under and to the interior of the valve.'I hese valves can be readily combined with the reversing-gear describedin Letters Patent granted to me December 27, 1864, or any other suitablereversing-gear may be applied to them; and in order to allow ofreversing the valves the seats have to be of the proper length,and eachseat is provided with two recesses, e or e', and with two otherrecesses, f orf', as clearly shown in the drawin s.

gfhis invention is applicable also to a doubleacting valve, as shown iu4Figs. 3, 4, and 5. In this case the valve is divided into Atwocompartments, A* Ait, and the exhaust side of the valve is provided withtwo slot-s, c* ct,

while the angular seat is furnished with two steam-ports, a* att, andwith two exhaustports, b* b't. The recesses f t in the exhaust side ofthe seat serve merely to relieve the valve of a portion of the pressure.In the position in which the valve is shown in Fig. 3 it just begins totake steam through the ports cd* and to exhaust through the ports a* andbit.

What I claim" as new, and desire to secure by Letters Patent, is

1. The angular valve, either double-acting 2 seem or single-acting, incombination with a oorrevalve-seat, in combination with the angularspondingly-angular seat,snbstuntia11y as and valve, substantially as endfor the purpose for the purpose described. set forth.

2. The recesses f f in the exhaust side of the Valve-seat, incombination with the angu- A' H' WOODRUFF' lar valve, substantially asand for the purpose Witnesses: set forth. M. M. LIVINGSTON,

3. The recesses e e in the steam side of the WV. HAUFF.

